Arc A580 not supporting 2560×1080
I have newly installed an Intel Arc A580 GPU and all is working at 1920x1080, but there doesn't seem to be any ability to use the native 2560×1080 resolution of my monitor when connected via HDMI (DP untested).
This is installed in an AMD 7900X system with 64GB RAM, in an Asus Prime X670E-PRO WIFI motherboard. It is connected through a KVM, but other systems work fine with full resolution, including the same system when connecting to the embedded GPU output.
It is running Debian, using kernel package linux-image-6.5.0-0.deb12.1-amd64, and Mesa 23.2.1 packages (although the issue seems to be basic mode-setting related).
The most relevant debug output seems to be the following, from dmesg | grep 2560
[ 3.645042] i915 0000:03:00.0: [drm:intel_crtc_state_dump [i915]] requested mode: "2560x1080": 60 185580 1024 2624 2688 2784 768 1083 1093 1111 0x40 0xa
[ 3.645084] i915 0000:03:00.0: [drm:intel_crtc_state_dump [i915]] adjusted mode: "2560x1080": 60 185580 2560 2624 2688 2784 1080 1083 1093 1111 0x40 0xa
[ 3.645126] i915 0000:03:00.0: [drm:intel_dump_crtc_timings [i915]] crtc timings: clock=185580, hd=2560 hb=2560-2784 hs=2624-2688 ht=2784, vd=1080 vb=1080-1111 vs=1083-1093 vt=1111, flags=0xa
[ 3.645170] i915 0000:03:00.0: [drm:intel_crtc_state_dump [i915]] pipe mode: "2560x1080": 60 185580 2560 2624 2688 2784 1080 1083 1093 1111 0x40 0xa
[ 3.645212] i915 0000:03:00.0: [drm:intel_dump_crtc_timings [i915]] crtc timings: clock=185580, hd=2560 hb=2560-2784 hs=2624-2688 ht=2784, vd=1080 vb=1080-1111 vs=1083-1093 vt=1111, flags=0xa
[ 3.645378] i915 0000:03:00.0: [drm:intel_crtc_state_dump [i915]] pch pfit: 2560x1080+0+0, enabled, force thru: no
[ 4.179786] [drm:drm_mode_debug_printmodeline [drm]] Modeline "2560x1080": 60 185580 2560 2624 2688 2784 1080 1083 1093 1111 0x48 0xa
[ 4.179806] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1080 mode: CLOCK_RANGE
[ 4.182261] i915 0000:03:00.0: [drm:pipe_config_mismatch [i915]] [CRTC:80:pipe A] fastset requirement not met in hw.pipe_mode.crtc_hdisplay (expected 2560, found 1920)
[ 4.182338] i915 0000:03:00.0: [drm:pipe_config_mismatch [i915]] [CRTC:80:pipe A] fastset requirement not met in hw.pipe_mode.crtc_hblank_start (expected 2560, found 1920)
[ 4.182618] i915 0000:03:00.0: [drm:pipe_config_mismatch [i915]] [CRTC:80:pipe A] fastset requirement not met in hw.adjusted_mode.crtc_hdisplay (expected 2560, found 1920)
[ 4.182688] i915 0000:03:00.0: [drm:pipe_config_mismatch [i915]] [CRTC:80:pipe A] fastset requirement not met in hw.adjusted_mode.crtc_hblank_start (expected 2560, found 1920)
[ 4.385180] [drm:drm_mode_debug_printmodeline [drm]] Modeline "2560x1080": 60 185580 2560 2624 2688 2784 1080 1083 1093 1111 0x48 0xa
[ 4.385514] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1080 mode: VIRTUAL_X
[ 7.525604] i915 0000:03:00.0: [drm:i915_perf_add_config_ioctl [i915]] Added config 88514dd5-9e66-457e-9493-8ffc78893322 id=501
[ 7.590817] [drm:drm_mode_debug_printmodeline [drm]] Modeline "2560x1080": 60 185580 2560 2624 2688 2784 1080 1083 1093 1111 0x48 0xa
[ 7.590837] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1080 mode: CLOCK_RANGE
[ 7.618502] [drm:drm_mode_debug_printmodeline [drm]] Modeline "2560x1080": 60 185580 2560 2624 2688 2784 1080 1083 1093 1111 0x48 0xa
[ 7.618518] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1080 mode: CLOCK_RANGE
[ 16.171133] [drm:drm_mode_debug_printmodeline [drm]] Modeline "2560x1080": 60 185580 2560 2624 2688 2784 1080 1083 1093 1111 0x48 0xa
[ 16.171150] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1080 mode: CLOCK_RANGE
[ 16.197996] [drm:drm_mode_debug_printmodeline [drm]] Modeline "2560x1080": 60 185580 2560 2624 2688 2784 1080 1083 1093 1111 0x48 0xa
[ 16.198012] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1080 mode: CLOCK_RANGE
[ 16.310754] [drm:drm_mode_debug_printmodeline [drm]] Modeline "2560x1080": 60 185580 2560 2624 2688 2784 1080 1083 1093 1111 0x48 0xa
[ 16.310771] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1080 mode: CLOCK_RANGElspci -vnn -d :*:0300
03:00.0 VGA compatible controller [0300]: Intel Corporation DG2 [Arc A580] [8086:56a2] (rev 08) (prog-if 00 [VGA controller])
Subsystem: ASRock Incorporation DG2 [Arc A580] [1849:6003]
Flags: bus master, fast devsel, latency 0, IRQ 113, IOMMU group 15
Memory at fa000000 (64-bit, non-prefetchable) [size=16M]
Memory at fa00000000 (64-bit, prefetchable) [size=8G]
Expansion ROM at fb000000 [disabled] [size=2M]
Capabilities: [40] Vendor Specific Information: Len=0c <?>
Capabilities: [70] Express Endpoint, MSI 00
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
Kernel modules: i915
14:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Raphael [1002:164e] (rev c2) (prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. Raphael [1043:8877]
Flags: bus master, fast devsel, latency 0, IRQ 96, IOMMU group 24
Memory at fc10000000 (64-bit, prefetchable) [size=256M]
Memory at fc20000000 (64-bit, prefetchable) [size=2M]
I/O ports at e000 [size=256]
Memory at fc700000 (32-bit, non-prefetchable) [size=512K]
Capabilities: [48] Vendor Specific Information: Len=08 <?>
Capabilities: [50] Power Management version 3
Capabilities: [64] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable- Count=1/4 Maskable- 64bit+
Capabilities: [c0] MSI-X: Enable+ Count=4 Masked-
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Capabilities: [270] Secondary PCI Express
Capabilities: [2a0] Access Control Services
Capabilities: [2b0] Address Translation Service (ATS)
Capabilities: [2c0] Page Request Interface (PRI)
Capabilities: [2d0] Process Address Space ID (PASID)
Capabilities: [410] Physical Layer 16.0 GT/s <?>
Capabilities: [450] Lane Margining at the Receiver <?>
Kernel driver in use: amdgpu
Kernel modules: amdgpu