https://bugs.kde.org/show_bug.cgi?id=520254
Bug ID: 520254
Summary: Input lag on Intel Arc A380 with i915 -
kwin_wayland_drm: atomic commit failed: Cannot
allocate memory
Classification: Plasma
Product: kwin
Version First 6.6.5
Reported In:
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 192361
--> https://bugs.kde.org/attachment.cgi?id=192361&action=edit
displays and layout
DESCRIPTION
I run a three-display setup (see attachment) with 2560x1440 resolution each-
I recently "upgraded" from a Nvidia 1060 GTX 6GB to an Intel Arc 380 6GB card
since support for the Nvidia card is running out. Although the card generally
works, I observe little stutters and general input lag, as well as choppy
animations when resizing or minimizing/restoring windows.
Every time lag happens, journalctl logs "kwin_wayland_drm: atomic commit
failed: Cannot allocate memory".
I do not observe this behavior when I swap back to the Nvidia card on the same
computer.
STEPS TO REPRODUCE
* Attach 3 displays to an Intel ARC A380 card
* Move mouse between windows, shuffle windows around
OBSERVED RESULT
* Input and animation lag
* Log show the following message every time the stutter happens:
---
May 16 17:01:24 kwin_wayland_wrapper[2832]: kwin_wayland_drm: atomic commit
failed: Cannot allocate memory
---
EXPECTED RESULT
* No input lag or stutter
SOFTWARE/OS VERSIONS
* Operating System: Gentoo x86_64, kernel 6.18.30-gentoo
* KDE Plasma Version: 6.6.5
* KDE Frameworks Version: 6.26
* Qt Version: 6.10.3
ADDITIONAL INFORMATION
Hardware:
* CPU: AMD Ryzen 9 3900X 12-Core
* Memory 64 GB RAM w/2133MHz
* Mainboard: Gigabyte X570 Aorus BIOS v.F41a (Apr 2026), ReBAR enabled
* Graphics card:
---
0b:00.0 VGA compatible controller: Intel Corporation DG2 [Arc A380] (rev 05)
(prog-if 00 [VGA controller])
Subsystem: ASRock Incorporation Device 6004
Flags: bus master, fast devsel, latency 0, IRQ 112, IOMMU group 26
Memory at fb000000 (64-bit, non-prefetchable) [size=16M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [40] Vendor Specific Information: Intel Capabilities v1
CapA: Peg60Dis- Peg12Dis- Peg11Dis- Peg10Dis- PeLWUDis-
DmiWidth=x4
EccDis- ForceEccEn- VTdDis- DmiG2Dis- PegG2Dis-
DDRMaxSize=Unlimited
1NDis- CDDis- DDPCDis- X2APICEn- PDCDis- IGDis- CDID=0
CRID=0
DDROCCAP- OCEn- DDRWrtVrefEn+ DDR3LEn+
CapB: ImguDis- OCbySSKUCap- OCbySSKUEn- SMTCap- CacheSzCap 0x0
SoftBinCap- DDR3MaxFreqWithRef100=Disabled PegG3Dis-
PkgTyp- AddGfxEn- AddGfxCap- PegX16Dis- DmiG3Dis- GmmDis-
DDR3MaxFreq=2932MHz LPDDR3En-
Capabilities: [70] Express Endpoint, IntMsgNum 0
Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable+ 64bit+
Capabilities: [d0] Power Management version 3
Capabilities: [100] Alternative Routing-ID Interpretation (ARI)
Capabilities: [420] Physical Resizable BAR
Capabilities: [400] Latency Tolerance Reporting
Kernel driver in use: i915
---
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