<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [Acer Aspire 4820TG] Kernel: trying to unbind memory from uninitialized GART !; EIP is at radeon_gart_unbind+0xca/0xe0 [radeon]()" href="https://bugs.freedesktop.org/show_bug.cgi?id=88927#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [Acer Aspire 4820TG] Kernel: trying to unbind memory from uninitialized GART !; EIP is at radeon_gart_unbind+0xca/0xe0 [radeon]()" href="https://bugs.freedesktop.org/show_bug.cgi?id=88927">bug 88927</a> from <a class="email" href="mailto:lorenzo.stanco@gmail.com" title="Lorenzo S. <lorenzo.stanco@gmail.com>"> Lorenzo S.</a> <pre>I have the same problem of OP (tiagdtd-lava) on Xubuntu 15.04 on Acer Aspire 4820TG with Radeon HD 5650. GUI freezes every 6-10 seconds for a whole second. Every time it freezes, fan speeds up and all of these lines are printed in kern.log: <a href="http://pastebin.com/raw.php?i=Rd63ZvHh">http://pastebin.com/raw.php?i=Rd63ZvHh</a> Kernel version is: Linux TIMELINEX 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Previosly Xubuntu 14.04.2 LTS was installed on the same laptop with no problems regarding X, Radeon or switchable graphics. Graphics switch was completely automatic (DynOn/DynOff) in 14.04.2, but now in 15.04 is not. I didn't tested kernel patches because I'm not practical about kernel recompiling (as you could guess when you read I'm a Xubuntu user). But I tried some kernel parameters and these are the results: 1) pci=noacpi OR noacpi No more freezes, but external USB mouse (and maybe other devices) stopped working at all :( 2) radeon.runpm=0 As suggested here <a href="https://bugzilla.kernel.org/show_bug.cgi?id=79701">https://bugzilla.kernel.org/show_bug.cgi?id=79701</a> and here <a href="https://bugzilla.kernel.org/show_bug.cgi?id=72701">https://bugzilla.kernel.org/show_bug.cgi?id=72701</a> this solve freezes and does not stop external devices to work. Anyway, as reported here <a href="https://bugzilla.kernel.org/show_bug.cgi?id=72701">https://bugzilla.kernel.org/show_bug.cgi?id=72701</a> by klod, this reduces battery life and increase internal temperature, because it does not turn off discrete graphic: # cat /sys/kernel/debug/vgaswitcheroo/switch 0:DIS-Audio: :Pwr:0000:01:00.1 1:IGD:+:Pwr:0000:00:02.0 2:DIS: :Pwr:0000:01:00.0 If I try to manually turn off discrete grahics using: # echo "DIGD" > /sys/kernel/debug/vgaswitcheroo/switch # echo "OFF" > /sys/kernel/debug/vgaswitcheroo/switch But as soon as I run these commands, in kern.log these lines are printed: <a href="http://pastebin.com/raw.php?i=WwSgEsEt">http://pastebin.com/raw.php?i=WwSgEsEt</a> (and it repeats at regular intervals), fan speeds up again and does not stop, system became instable, network stops working and system shut down hangs! Is there a change I can fix this, or it's better if I downgrade to 14.04.2 LTS?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>