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<font face="Ubuntu Mono">Dear Experts<br>
<br>
I write to you as an ignorant user of Linux. I had problems with
my laptop in order to switch from the AMD APU to the dedicated
Radeon GPU: I asked on Ubuntu ask, and nobody answered, I asked on
Ubuntu global forum, and nobody answered; I asked on Italian
ubuntu community forum, and nobody answered. <br>
So I hope you answer me, just to know why I have this problem <br>
The problem is that one<br>
<br>
</font><br>
I had that problem on Ubuntu 14.04, and I never have been able to
resolve it. Now, on Ubuntu 16.04, I think I would find a solution: i
can't switch from APU A4-6210 to the dedicated graphic card AMD
Radeon HD 8570M. Using PRIME as described on the Italian community
guide. i put the command<br>
<br>
<div class="bbcode_container">
<div class="bbcode_description"><br>
</div>
<pre class="bbcode_code" style="height:36px;">xrandr --listproviders</pre>
</div>
and it gives to me that:<br>
<div class="bbcode_container">
<div class="bbcode_description"><br>
</div>
<pre class="bbcode_code" style="height:72px;">Providers: number : 3
Provider 0: id: 0x74 cap: 0x9, Source Output, Sink Offload crtcs: 2 outputs: 3 associated providers: 2 name:MULLINS @ pci:0000:00:01.0
Provider 1: id: 0x3f cap: 0x6, Sink Output, Source Offload crtcs: 0 outputs: 0 associated providers: 2 name:HAINAN @ pci:0000:01:00.0
Provider 2: id: 0x3f cap: 0x6, Sink Output, Source Offload crtcs: 0 outputs: 0 associated providers: 2 name:HAINAN @ pci:0000:01:00.0</pre>
</div>
So I can see my APU (Mullins) but <b>TWO</b> (?) Radeon (Hainan)
Goning on with the guide, i put the IDs of the two graphic cards
(0x74 e 0x3f) and I tried to start some programs with the Radeon.
Giving the command<br>
<div class="bbcode_container">
<div class="bbcode_description"><br>
</div>
<pre class="bbcode_code" style="height:36px;">DRI_PRIME=1 0ad</pre>
</div>
To try it on the famous linux videogame 0 A.D., but I had a black
screen with this message<br>
<a
href="http://www.imagestime.com/imageshow.php/1100381_IMG20170210144420.jpg"
target="_blank">http://www.imagestime.com/imageshow.php/1100381_IMG20170210144420.jpg<br>
</a> I have no idea of what it could be, the only thing I remember
is that on Ubuntu 14.04 I had to fix a brightness problem, which I
resolved changing something in that folder (I think). <br>
<br>
I also tried to give this command<br>
<br>
<pre class="bbcode_code" style="height:372px;">francesco@Francesco:~$ dmesg | egrep 'drm|radeon'
[ 2.093014] [drm] Initialized drm 1.1.0 20060810
[ 2.162969] [drm] radeon kernel modesetting enabled.
[ 2.175086] fb: switching to radeondrmfb from EFI VGA
[ 2.175767] [drm] initializing kernel modesetting (MULLINS 0x1002:0x9850 0x103C:0x22CE).
[ 2.175791] [drm] register mmio base: 0xF0F00000
[ 2.175793] [drm] register mmio size: 262144
[ 2.175803] [drm] doorbell mmio base: 0xF0000000
[ 2.175806] [drm] doorbell mmio size: 8388608
[ 2.175814] [drm] ACPI VFCT contains a BIOS for 00:01.0 1002:9850, size 60416
[ 2.175978] radeon 0000:00:01.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used)
[ 2.175983] radeon 0000:00:01.0: GTT: 2048M 0x0000000020000000 - 0x000000009FFFFFFF
[ 2.175986] [drm] Detected VRAM RAM=512M, BAR=256M
[ 2.175989] [drm] RAM width 128bits DDR
[ 2.176415] [drm] radeon: 512M of VRAM memory ready
[ 2.176418] [drm] radeon: 2048M of GTT memory ready.
[ 2.176443] [drm] Loading mullins Microcode
[ 2.178545] [drm] Internal thermal controller without fan control
[ 2.179442] [drm] radeon: dpm initialized
[ 2.181906] [drm] Found VCE firmware/feedback version 40.2.2 / 15!
[ 2.184388] [drm] GART: num cpu pages 524288, num gpu pages 524288
[ 2.218985] [drm] PCIE GART of 2048M enabled (table at 0x0000000000324000).
[ 2.219202] radeon 0000:00:01.0: WB enabled
[ 2.219222] radeon 0000:00:01.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff880035765c00
[ 2.219227] radeon 0000:00:01.0: fence driver on ring 1 use gpu addr 0x0000000020000c04 and cpu addr 0xffff880035765c04
[ 2.219232] radeon 0000:00:01.0: fence driver on ring 2 use gpu addr 0x0000000020000c08 and cpu addr 0xffff880035765c08
[ 2.219236] radeon 0000:00:01.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff880035765c0c
[ 2.219240] radeon 0000:00:01.0: fence driver on ring 4 use gpu addr 0x0000000020000c10 and cpu addr 0xffff880035765c10
[ 2.219743] radeon 0000:00:01.0: fence driver on ring 5 use gpu addr 0x0000000000076c98 and cpu addr 0xffffc90001036c98
[ 2.219940] radeon 0000:00:01.0: fence driver on ring 6 use gpu addr 0x0000000020000c18 and cpu addr 0xffff880035765c18
[ 2.219945] radeon 0000:00:01.0: fence driver on ring 7 use gpu addr 0x0000000020000c1c and cpu addr 0xffff880035765c1c
[ 2.219950] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 2.219952] [drm] Driver supports precise vblank timestamp query.
[ 2.220012] radeon 0000:00:01.0: radeon: using MSI.
[ 2.220052] [drm] radeon: irq initialized.
[ 2.224128] [drm] ring test on 0 succeeded in 3 usecs
[ 2.224225] [drm] ring test on 1 succeeded in 2 usecs
[ 2.224244] [drm] ring test on 2 succeeded in 2 usecs
[ 2.224464] [drm] ring test on 3 succeeded in 4 usecs
[ 2.224473] [drm] ring test on 4 succeeded in 4 usecs
[ 2.250323] [drm] ring test on 5 succeeded in 2 usecs
[ 2.250339] [drm] UVD initialized successfully.
[ 2.359548] [drm] ring test on 6 succeeded in 12 usecs
[ 2.359560] [drm] ring test on 7 succeeded in 2 usecs
[ 2.359562] [drm] VCE initialized successfully.
[ 2.362787] [drm] ib test on ring 0 succeeded in 0 usecs
[ 2.362827] [drm] ib test on ring 1 succeeded in 0 usecs
[ 2.862202] [drm] ib test on ring 2 succeeded in 0 usecs
[ 2.862284] [drm] ib test on ring 3 succeeded in 0 usecs
[ 2.862348] [drm] ib test on ring 4 succeeded in 0 usecs
[ 3.362225] [drm] ib test on ring 5 succeeded
[ 3.362800] [drm] ib test on ring 6 succeeded
[ 3.363310] [drm] ib test on ring 7 succeeded
[ 3.366425] [drm] radeon atom DIG backlight initialized
[ 3.366430] [drm] Radeon Display Connectors
[ 3.366432] [drm] Connector 0:
[ 3.366434] [drm] eDP-1
[ 3.366436] [drm] HPD1
[ 3.366440] [drm] DDC: 0x6530 0x6530 0x6534 0x6534 0x6538 0x6538 0x653c 0x653c
[ 3.366442] [drm] Encoders:
[ 3.366444] [drm] LCD1: INTERNAL_UNIPHY
[ 3.366446] [drm] Connector 1:
[ 3.366448] [drm] HDMI-A-1
[ 3.366449] [drm] HPD2
[ 3.366452] [drm] DDC: 0x6540 0x6540 0x6544 0x6544 0x6548 0x6548 0x654c 0x654c
[ 3.366454] [drm] Encoders:
[ 3.366455] [drm] DFP1: INTERNAL_UNIPHY
[ 3.366457] [drm] Connector 2:
[ 3.366459] [drm] VGA-1
[ 3.366462] [drm] DDC: 0x65c0 0x65c0 0x65c4 0x65c4 0x65c8 0x65c8 0x65cc 0x65cc
[ 3.366463] [drm] Encoders:
[ 3.366465] [drm] CRT1: INTERNAL_KLDSCP_DAC1
[ 3.668202] [drm] fb mappable at 0xE0728000
[ 3.668210] [drm] vram apper at 0xE0000000
[ 3.668213] [drm] size 4325376
[ 3.668216] [drm] fb depth is 24
[ 3.668219] [drm] pitch is 5632
[ 3.668451] fbcon: radeondrmfb (fb0) is primary device
[ 3.668685] radeon 0000:00:01.0: fb0: radeondrmfb frame buffer device
[ 3.694838] [drm] Initialized radeon 2.43.0 20080528 for 0000:00:01.0 on minor 0
[ 3.695027] radeon 0000:01:00.0: enabling device (0002 -> 0003)
[ 3.695500] [drm] initializing kernel modesetting (HAINAN 0x1002:0x666F 0x103C:0x22CE).
[ 3.695530] [drm] register mmio base: 0xF0E00000
[ 3.695532] [drm] register mmio size: 262144
[ 3.767122] [drm] GPU not posted. posting now...
[ 3.772878] radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
[ 3.772884] radeon 0000:01:00.0: GTT: 2048M 0x0000000040000000 - 0x00000000BFFFFFFF
[ 3.772888] [drm] Detected VRAM RAM=1024M, BAR=256M
[ 3.772891] [drm] RAM width 64bits DDR
[ 3.772920] [drm] radeon: 1024M of VRAM memory ready
[ 3.772923] [drm] radeon: 2048M of GTT memory ready.
[ 3.772949] [drm] Loading hainan Microcode
[ 3.773226] [drm] External GPIO thermal controller with fan control
[ 3.773277] [drm] probing gen 2 caps for device 1022:1439 = 733c41/6
[ 3.784858] [drm] radeon: dpm initialized
[ 3.784872] [drm] GART: num cpu pages 524288, num gpu pages 524288
[ 3.788276] [drm] probing gen 2 caps for device 1022:1439 = 733c41/6
[ 3.788287] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
[ 4.249100] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
[ 4.249319] radeon 0000:01:00.0: WB enabled
[ 4.249326] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff880033fa0c00
[ 4.249331] radeon 0000:01:00.0: fence driver on ring 1 use gpu addr 0x0000000040000c04 and cpu addr 0xffff880033fa0c04
[ 4.249335] radeon 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000040000c08 and cpu addr 0xffff880033fa0c08
[ 4.249339] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff880033fa0c0c
[ 4.249343] radeon 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000040000c10 and cpu addr 0xffff880033fa0c10
[ 4.249348] radeon 0000:01:00.0: VCE init error (-22).
[ 4.249352] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 4.249355] [drm] Driver supports precise vblank timestamp query.
[ 4.249358] radeon 0000:01:00.0: radeon: MSI limited to 32-bit
[ 4.249435] radeon 0000:01:00.0: radeon: using MSI.
[ 4.249482] [drm] radeon: irq initialized.
[ 4.665976] [drm] ring test on 0 succeeded in 1 usecs
[ 4.665989] [drm] ring test on 1 succeeded in 1 usecs
[ 4.665999] [drm] ring test on 2 succeeded in 1 usecs
[ 4.666013] [drm] ring test on 3 succeeded in 4 usecs
[ 4.666023] [drm] ring test on 4 succeeded in 4 usecs
[ 4.666701] [drm] ib test on ring 0 succeeded in 0 usecs
[ 4.666744] [drm] ib test on ring 1 succeeded in 0 usecs
[ 4.666794] [drm] ib test on ring 2 succeeded in 0 usecs
[ 4.666820] [drm] ib test on ring 3 succeeded in 0 usecs
[ 4.666842] [drm] ib test on ring 4 succeeded in 0 usecs
[ 4.667987] [drm] Radeon Display Connectors
[ 4.670375] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[ 4.670538] [drm] Initialized radeon 2.43.0 20080528 for 0000:01:00.0 on minor 1
[ 18.469340] [drm] probing gen 2 caps for device 1022:1439 = 733c41/6
[ 18.469350] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
[ 18.940666] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
[ 18.940910] radeon 0000:01:00.0: WB enabled
[ 18.940917] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff880033fa0c00
[ 18.940922] radeon 0000:01:00.0: fence driver on ring 1 use gpu addr 0x0000000040000c04 and cpu addr 0xffff880033fa0c04
[ 18.940927] radeon 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000040000c08 and cpu addr 0xffff880033fa0c08
[ 18.940931] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff880033fa0c0c
[ 18.940935] radeon 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000040000c10 and cpu addr 0xffff880033fa0c10
[ 18.940939] radeon 0000:01:00.0: VCE init error (-22).
[ 19.359047] [drm] ring test on 0 succeeded in 1 usecs
[ 19.359064] [drm] ring test on 1 succeeded in 1 usecs
[ 19.359073] [drm] ring test on 2 succeeded in 1 usecs
[ 19.359090] [drm] ring test on 3 succeeded in 5 usecs
[ 19.359100] [drm] ring test on 4 succeeded in 4 usecs
[ 19.359154] [drm] ib test on ring 0 succeeded in 0 usecs
[ 19.359194] [drm] ib test on ring 1 succeeded in 0 usecs
[ 19.359240] [drm] ib test on ring 2 succeeded in 0 usecs
[ 19.359269] [drm] ib test on ring 3 succeeded in 0 usecs
[ 19.359292] [drm] ib test on ring 4 succeeded in 0 usecs
[ 35.875820] [drm] probing gen 2 caps for device 1022:1439 = 733c41/6
[ 35.875830] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
[ 36.345069] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
[ 36.345254] radeon 0000:01:00.0: WB enabled
[ 36.345261] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff880033fa0c00
[ 36.345266] radeon 0000:01:00.0: fence driver on ring 1 use gpu addr 0x0000000040000c04 and cpu addr 0xffff880033fa0c04
[ 36.345271] radeon 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000040000c08 and cpu addr 0xffff880033fa0c08
[ 36.345276] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff880033fa0c0c
[ 36.345280] radeon 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000040000c10 and cpu addr 0xffff880033fa0c10
[ 36.345285] radeon 0000:01:00.0: VCE init error (-22).
[ 36.761081] [drm] ring test on 0 succeeded in 1 usecs
[ 36.761094] [drm] ring test on 1 succeeded in 1 usecs
[ 36.761104] [drm] ring test on 2 succeeded in 1 usecs
[ 36.761118] [drm] ring test on 3 succeeded in 4 usecs
[ 36.761128] [drm] ring test on 4 succeeded in 4 usecs
[ 36.761176] [drm] ib test on ring 0 succeeded in 0 usecs
[ 36.761245] [drm] ib test on ring 1 succeeded in 0 usecs
[ 36.761285] [drm] ib test on ring 2 succeeded in 0 usecs
[ 36.761312] [drm] ib test on ring 3 succeeded in 0 usecs
[ 36.761332] [drm] ib test on ring 4 succeeded in 0 usecs
[ 53.257493] [drm] probing gen 2 caps for device 1022:1439 = 733c41/6
[ 53.257505] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
[ 53.727179] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
[ 53.727358] radeon 0000:01:00.0: WB enabled
[ 53.727365] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff880033fa0c00
[ 53.727371] radeon 0000:01:00.0: fence driver on ring 1 use gpu addr 0x0000000040000c04 and cpu addr 0xffff880033fa0c04
[ 53.727376] radeon 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000040000c08 and cpu addr 0xffff880033fa0c08
[ 53.727380] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff880033fa0c0c
[ 53.727385] radeon 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000040000c10 and cpu addr 0xffff880033fa0c10
[ 53.727390] radeon 0000:01:00.0: VCE init error (-22).
[ 54.143793] [drm] ring test on 0 succeeded in 1 usecs
[ 54.143807] [drm] ring test on 1 succeeded in 1 usecs
[ 54.143816] [drm] ring test on 2 succeeded in 1 usecs
[ 54.143833] [drm] ring test on 3 succeeded in 4 usecs
[ 54.143843] [drm] ring test on 4 succeeded in 4 usecs
[ 54.143887] [drm] ib test on ring 0 succeeded in 0 usecs
[ 54.143968] [drm] ib test on ring 1 succeeded in 0 usecs
[ 54.144008] [drm] ib test on ring 2 succeeded in 0 usecs
[ 54.144033] [drm] ib test on ring 3 succeeded in 0 usecs
[ 54.144054] [drm] ib test on ring 4 succeeded in 0 usecs
[ 74.693286] [drm] probing gen 2 caps for device 1022:1439 = 733c41/6
[ 74.693298] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
[ 75.162641] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
[ 75.162817] radeon 0000:01:00.0: WB enabled
[ 75.162824] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff880033fa0c00
[ 75.162829] radeon 0000:01:00.0: fence driver on ring 1 use gpu addr 0x0000000040000c04 and cpu addr 0xffff880033fa0c04
[ 75.162834] radeon 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000040000c08 and cpu addr 0xffff880033fa0c08
[ 75.162839] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff880033fa0c0c
[ 75.162843] radeon 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000040000c10 and cpu addr 0xffff880033fa0c10
[ 75.162849] radeon 0000:01:00.0: VCE init error (-22).
[ 75.578019] [drm] ring test on 0 succeeded in 1 usecs
[ 75.578033] [drm] ring test on 1 succeeded in 1 usecs
[ 75.578042] [drm] ring test on 2 succeeded in 1 usecs
[ 75.578058] [drm] ring test on 3 succeeded in 5 usecs
[ 75.578069] [drm] ring test on 4 succeeded in 4 usecs
[ 75.578113] [drm] ib test on ring 0 succeeded in 0 usecs
[ 75.578200] [drm] ib test on ring 1 succeeded in 0 usecs
[ 75.578242] [drm] ib test on ring 2 succeeded in 0 usecs
[ 75.578295] [drm] ib test on ring 3 succeeded in 0 usecs
[ 75.578317] [drm] ib test on ring 4 succeeded in 0 usecs
francesco@Francesco:~$
And you can see two error point: " VCE init error (-22)" and the other "*ERROR* Cannot find a backlight controller"
So, can you help me? Just to know why :)
</pre>
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