[Bug 17360] New: Corruption followed by lockup after suspend/resume, unless AGPMode 2 specified [Radeon Mobility M6 LY]

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=17360

           Summary: Corruption followed by lockup after suspend/resume,
                    unless AGPMode 2 specified [Radeon Mobility M6 LY]
           Product: xorg
           Version: 7.3
          Platform: Other
               URL: https://bugs.edge.launchpad.net/ubuntu/+source/xserver-
                    xorg-video-ati/+bug/248438
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: bryce at bryceharrington.org
         QAContact: xorg-team at lists.x.org


Forwarding bug report from a Ubuntu user:
https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/248438

On the mobility M6 LY, after doing a suspend/resume, graphical errors start
accumulating, and eventually locks up.

Specifying Option "AGPMode" "2" makes the problems go away.



Original Report:
"A recent (last month or two) driver update causes the M6 LY to behave weirdly
when suspending/resuming.

On resume, graphical errors pop up. Horizontal regions (I'd say 10-20 pixels
long and 1 pixel high) begin to appear when regions are redrawn (text in
consoles scrolling/windows resizing). Additionally, regions appear in some
windows where (moving left to right and top to bottom) the first 100 or so
pixels are scrambled followed by a black region. Resizing the windows makes the
affected regions disappear, but they are replaced by new glitches. It also
seems like hardware mouse acceleration is effected. The mouse moves with a
.5sec refresh rate after restarting.

Eventually, the glitches get more and more common until the machine locks hard
(no ctrl+alt+backspace, caps lock key is unresponsive).

Xorg.log doesn't have any errors, so I'm at a loss to figure out where to look.
Looking at lspci -vv, it seems like there might be a problem with the memory
detection routines? There is only 16MB of video ram on this machine, and 128MB
is reported (region 0). If it was including AGP memory, it would be in
powers-of two and 116MB isn't.

Any suggestions? The attached log shows me booting, suspending/resuming and
switching to/from a VT. When I switched to the VT, nothing came up. I tried
upgrading my ati driver with a version from
https://launchpad.net/~tormodvolden/+archive , to no effect.

$ lspci -vv
1:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY
(prog-if 00 [VGA controller])
"


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