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List:       freedesktop-xorg
Subject:    X windows freeze with Mobility Radeon X1400 on Xubuntu 16.04 when returning from blank screen
From:       Erik Brangs <erik.brangs () gmx ! de>
Date:       2016-04-21 13:17:02
Message-ID: 5718D2CE.4080501 () gmx ! de
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Hi,

I'm using Xubuntu 16.04 on my Lenovo Thinkpad T60. It has a Radeon graphics card:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV515/M54 \
[Mobility Radeon X1400]

When I try to use the laptop again after the screen has blanked, XFCE freezes from \
time to time after restoring the previous screen contents. I can still move the mouse \
cursor but clicking has no effect. I also can't switch to a terminal. Login via SSH \
still works.

The only thing that I've been able to find out is that the chance for the freeze to \
occur seems to depend on the kernel version. With the 4.0.x series, the chance was \
rather low (less than 1 in 20). With the 4.2.x and 4.4.x series, the chance for a \
freeze to occur seems to be much higher. The latest kernel that I tested was 4.6-rc4 \
from the Ubuntu mainline crack repository ( \
http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D ) which also seems to have a \
high chance for a freeze to occur.

dmesg: http://www.hastebin.com/kagifawete.vhdl
Xorg.log.0: http://hastebin.com/dijajetajo.vhdl

I'm not sure if it's related but I also saw a freeze where the screen didn't reappear \
before freezing (with 4.6-rc4). In this case, I hadn't used the laptop for some time \
and the whole dmesg output consisted of messages like:

[18883.528089] radeon 0000:01:00.0: ring 0 stalled for more than 10488msec
[18883.528101] radeon 0000:01:00.0: GPU lockup (current fence id 0x00000000000004f3 \
last fence id 0x00000000000005d5 on ring 0) [18883.532747] radeon 0000:01:00.0: Saved \
245019 dwords of commands on ring 0. [18883.532761] radeon 0000:01:00.0: GPU reset \
succeeded, trying to resume [18883.532774] radeon 0000:01:00.0: ffff880034ddc000 \
unpin not necessary [18883.542676] [drm] radeon: 1 quad pipes, 1 z pipes initialized.
[18883.545556] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
[18883.545563] radeon 0000:01:00.0: WB enabled
[18883.545570] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr \
0x0000000008000000 and cpu addr 0xffff880034dca000 [18883.545640] [drm] radeon: ring \
at 0x0000000008001000 [18884.201308] [drm:r100_ring_test [radeon]] *ERROR* radeon: \
ring test failed (scratch(0x15E8)=0xCAFEDEAD) [18884.201337] [drm:r100_cp_init \
[radeon]] *ERROR* radeon: cp isn't working (-22). [18884.201342] radeon 0000:01:00.0: \
failed initializing CP (-22).

I'm not sure what I can do to investigate this. Ubuntu provides some information on X \
freezes at https://wiki.ubuntu.com/X/Troubleshooting/Freeze . I tried using xset but \
it doesn't currently seem to help in reproducing the problem.


Kind regards,

Erik Brangs
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