Date:   Fri, 27 May 2022 11:00:39 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     amd-gfx@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org
Subject: amdgpu errors (VM fault / GPU fault detected) with 5.19 merge window
 snapshots

Hello,

while testing 5.19 merge window snapshots (commits babf0bb978e3 and
7e284070abe5), I keep getting errors like below. I have not seen them
with 5.18 final or older.

------------------------------------------------------------------------
[  247.150333] gmc_v8_0_process_interrupt: 46 callbacks suppressed
[  247.150336] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00020802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  247.150339] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00107800
[  247.150340] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0D008002
[  247.150341] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 6, pasid 32780) at page 1079296, write from 'TC2' (0x54433200) (8)
[  248.866434] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00120802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  248.866438] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00138802
[  248.866439] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0D008002
[  248.866440] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 6, pasid 32780) at page 1280002, write from 'TC2' (0x54433200) (8)
[  248.866775] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x000a0802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  248.866776] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00138C01
[  248.866777] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0D008002
[  248.866777] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 6, pasid 32780) at page 1281025, write from 'TC2' (0x54433200) (8)
[  248.866884] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00020802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  248.866885] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00139400
[  248.866885] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0D008002
[  248.866886] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 6, pasid 32780) at page 1283072, write from 'TC2' (0x54433200) (8)
[  248.866939] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00020802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  248.866940] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00139800
[  248.866940] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0D008002
[  248.866941] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 6, pasid 32780) at page 1284096, write from 'TC2' (0x54433200) (8)
[  248.867000] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00020802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  248.867001] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00139C00
[  248.867001] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0D008002
[  248.867002] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 6, pasid 32780) at page 1285120, write from 'TC2' (0x54433200) (8)
[  248.879700] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00020802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  248.879704] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0013D600
[  248.879705] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x03008002
[  248.879706] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 1, pasid 32780) at page 1299968, write from 'TC2' (0x54433200) (8)
[  248.883086] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x000a0802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  248.883088] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0013EE01
[  248.883088] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x03008002
[  248.883089] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 1, pasid 32780) at page 1306113, write from 'TC2' (0x54433200) (8)
[  249.191811] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00020802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  249.191815] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00142C00
[  249.191816] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0D008002
[  249.191817] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 6, pasid 32780) at page 1321984, write from 'TC2' (0x54433200) (8)
[  249.193491] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00085202 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  249.193493] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00142C01
[  249.193493] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0C052002
[  249.193494] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 6, pasid 32780) at page 1321985, read from 'CBC1' (0x43424331) (82)
[  249.925909] amdgpu 0000:0c:00.0: amdgpu: IH ring buffer overflow (0x000844C0, 0x00004A00, 0x000044D0)
[  250.434986] [drm] Fence fallback timer expired on ring sdma0
[  466.621568] gmc_v8_0_process_interrupt: 122 callbacks suppressed
[  466.621573] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x000a0802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[  466.621575] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00161401
[  466.621575] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0B008002
[  466.621576] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 5, pasid 32780) at page 1446913, write from 'TC2' (0x54433200) (8)
[ 1044.915401] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00020802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[ 1044.915405] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0016BE00
[ 1044.915406] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x07008002
[ 1044.915407] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 3, pasid 32780) at page 1490432, write from 'TC2' (0x54433200) (8)
[ 1059.900168] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00020802 for process firefox pid 6101 thread firefox:cs0 pid 6116
[ 1059.900172] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0016F600
[ 1059.900173] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x09008002
[ 1059.900174] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32780) at page 1504768, write from 'TC2' (0x54433200) (8)
[ 3972.123585] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x0ac20402 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.123589] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010D958
[ 3972.123590] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x09004002
[ 3972.123591] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1104216, write from 'TC3' (0x54433300) (4)
[ 3972.123644] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x0ada0802 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.123645] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010D95B
[ 3972.123646] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x09008002
[ 3972.123646] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1104219, write from 'TC2' (0x54433200) (8)
[ 3972.124308] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x02024802 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.124309] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010DA40
[ 3972.124309] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x09048002
[ 3972.124310] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1104448, write from 'TC0' (0x54433000) (72)
[ 3972.124993] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x0ac06202 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.124994] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010D958
[ 3972.124995] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x08062002
[ 3972.124995] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1104216, read from 'CBC0' (0x43424330) (98)
[ 3972.124999] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x0ac02202 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.124999] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010D843
[ 3972.125000] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x09050002
[ 3972.125000] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1103939, write from 'CB1' (0x43423100) (80)
[ 3972.125004] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x0ac01202 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.125005] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010D891
[ 3972.125005] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x09010002
[ 3972.125005] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1104017, write from 'CB3' (0x43423300) (16)
[ 3972.125009] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x0ac05202 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.125010] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010D8CB
[ 3972.125010] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x09050002
[ 3972.125011] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1104075, write from 'CB1' (0x43423100) (80)
[ 3972.125015] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x002a1002 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.125015] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010D831
[ 3972.125016] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x09060002
[ 3972.125016] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1103921, write from 'CB0' (0x43423000) (96)
[ 3972.125020] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x002a2002 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.125021] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010D8B0
[ 3972.125021] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x09050002
[ 3972.125021] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1104048, write from 'CB1' (0x43423100) (80)
[ 3972.129482] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x0ac04802 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3972.129483] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0010D958
[ 3972.129484] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x08048002
[ 3972.129484] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 4, pasid 32781) at page 1104216, read from 'TC0' (0x54433000) (72)
[ 3979.889515] gmc_v8_0_process_interrupt: 530 callbacks suppressed
[ 3979.889519] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x02020802 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.889522] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C40
[ 3979.889523] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x05008002
[ 3979.889523] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326144, write from 'TC2' (0x54433200) (8)
[ 3979.889975] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x02001202 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.889976] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C40
[ 3979.889977] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x04012002
[ 3979.889977] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326144, read from 'CBC3' (0x43424333) (18)
[ 3979.889982] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x02002202 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.889983] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C05
[ 3979.889983] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x05020002
[ 3979.889984] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326085, write from 'CB2' (0x43423200) (32)
[ 3979.889988] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x02005202 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.889989] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C07
[ 3979.889989] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x05050002
[ 3979.889990] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326087, write from 'CB1' (0x43423100) (80)
[ 3979.889994] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x02006202 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.889995] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C15
[ 3979.889995] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x05010002
[ 3979.889995] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326101, write from 'CB3' (0x43423300) (16)
[ 3979.890000] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x002a2002 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.890001] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C19
[ 3979.890001] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x05010002
[ 3979.890002] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326105, write from 'CB3' (0x43423300) (16)
[ 3979.890006] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x002a1002 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.890007] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C30
[ 3979.890007] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x05010002
[ 3979.890007] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326128, write from 'CB3' (0x43423300) (16)
[ 3979.890012] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x000a2002 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.890013] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C32
[ 3979.890013] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x05010002
[ 3979.890014] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326130, write from 'CB3' (0x43423300) (16)
[ 3979.890017] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x000a1002 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.890018] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C28
[ 3979.890018] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x05010002
[ 3979.890019] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326120, write from 'CB3' (0x43423300) (16)
[ 3979.891937] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x02000802 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 3979.891937] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00143C40
[ 3979.891938] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x04008002
[ 3979.891938] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 2, pasid 32781) at page 1326144, read from 'TC2' (0x54433200) (8)
[ 4062.912573] gmc_v8_0_process_interrupt: 2 callbacks suppressed
[ 4062.912578] amdgpu 0000:0c:00.0: amdgpu: GPU fault detected: 147 0x00004802 for process stellarium pid 8057 thread stellarium:cs0 pid 8060
[ 4062.912580] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00000800
[ 4062.912581] amdgpu 0000:0c:00.0: amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x06048002
[ 4062.912582] amdgpu 0000:0c:00.0: amdgpu: VM fault (0x02, vmid 3, pasid 32781) at page 2048, read from 'TC0' (0x54433000) (72)
------------------------------------------------------------------------

There does not seem to be any apparent immediate problem with graphics
but when running commit babf0bb978e3, there seemed to be a noticeable
lag in some operations, e.g. when moving a window or repainting large
part of the terminal window in konsole (no idea if it's related).

My GPU is Radeon Pro WX 2100 (1002:6995). What other information should
I collect to help debugging the issue?

Michal Kubecek

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