Public bug reported:

GPU: ATI Radeon 3100 Graphics (ChipID = 0x9611) (RS780)

GPU Lockup message in dmesg output after resume:
[  916.000550] radeon 0000:01:05.0: ring 0 stalled for more than 10084msec
[  916.000569] radeon 0000:01:05.0: GPU lockup (current fence id 
0x00000000000020cc last fence id 0x00000000000020d6 on ring 0)
[  916.516556] radeon 0000:01:05.0: ring 0 stalled for more than 10600msec
[  916.516569] radeon 0000:01:05.0: GPU lockup (current fence id 
0x00000000000020cc last fence id 0x00000000000020d6 on ring 0)
[  917.024566] radeon 0000:01:05.0: ring 0 stalled for more than 11108msec
[  917.024575] radeon 0000:01:05.0: GPU lockup (current fence id 
0x00000000000020cc last fence id 0x00000000000020d6 on ring 0)
[  917.536558] radeon 0000:01:05.0: ring 0 stalled for more than 11620msec
[  917.536570] radeon 0000:01:05.0: GPU lockup (current fence id 
0x00000000000020cc last fence id 0x00000000000020d6 on ring 0)
[  918.048571] radeon 0000:01:05.0: ring 0 stalled for more than 12132msec
[  918.048580] radeon 0000:01:05.0: GPU lockup (current fence id 
0x00000000000020cc last fence id 0x00000000000020d6 on ring 0)
...
[  935.726783] radeon 0000:01:05.0: GPU softreset: 0x00000019
[  935.726788] radeon 0000:01:05.0:   R_008010_GRBM_STATUS      = 0xE57034E0
[  935.726793] radeon 0000:01:05.0:   R_008014_GRBM_STATUS2     = 0x00110103
[  935.726797] radeon 0000:01:05.0:   R_000E50_SRBM_STATUS      = 0x20000040
[  935.726801] radeon 0000:01:05.0:   R_008674_CP_STALLED_STAT1 = 0x01000000
[  935.726805] radeon 0000:01:05.0:   R_008678_CP_STALLED_STAT2 = 0x00001002
[  935.726809] radeon 0000:01:05.0:   R_00867C_CP_BUSY_STAT     = 0x00028486
[  935.726813] radeon 0000:01:05.0:   R_008680_CP_STAT          = 0x80838645
[  935.726817] radeon 0000:01:05.0:   R_00D034_DMA_STATUS_REG   = 0x44C83D57
[  935.779906] radeon 0000:01:05.0: R_008020_GRBM_SOFT_RESET=0x00007FEF
[  935.779962] radeon 0000:01:05.0: SRBM_SOFT_RESET=0x00000100
[  935.782061] radeon 0000:01:05.0:   R_008010_GRBM_STATUS      = 0xA0003030
[  935.782066] radeon 0000:01:05.0:   R_008014_GRBM_STATUS2     = 0x00000003
[  935.782070] radeon 0000:01:05.0:   R_000E50_SRBM_STATUS      = 0x20008040
[  935.782074] radeon 0000:01:05.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
[  935.782078] radeon 0000:01:05.0:   R_008678_CP_STALLED_STAT2 = 0x00000000
[  935.782081] radeon 0000:01:05.0:   R_00867C_CP_BUSY_STAT     = 0x00000000
[  935.782085] radeon 0000:01:05.0:   R_008680_CP_STAT          = 0x80100000
[  935.782089] radeon 0000:01:05.0:   R_00D034_DMA_STATUS_REG   = 0x44C83D57
[  935.782097] radeon 0000:01:05.0: GPU reset succeeded, trying to resume
Graphics is broken... text hardly readable, interface not responding.

First observed on latest Mint (20.2)... then discovered Peppermint 10 was not 
affected.
I believe Peppermint 10 is based on 18.04 and I am unsure why it is not 
affected.

I tested with many versions of Ubuntu...
Before 17.04... no problem... but was using EXA acceleration.
17.04 first to use Glamor... screen corruption is not obvious... but dmesg show
GPU lockup...
17.10 and following is really problematic after resume, but possible to 
Ctrl-Alt-F4 to go to a text console and ... sudo reboot.
There is a possibility I missed the exact version as I don't have my notes near 
me.

Adding Option "AccelMethod" "EXA"
at the good place in xorg.conf file have fixed the issue.

I am unlikely to have access again to that specific computer in the
future.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1944991

Title:
  Resume with glamor cause GPU lockup/screen corruption on Radeon 3100
  Graphics" (ChipID = 0x9611)

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