Bug 217945
| Summary: | DRM error - flickering screen with mouse cursor over low right corner - with IOMMU | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | jb (jb.1234abcd) |
| Component: | Video(Other) | Assignee: | drivers_video-other |
| Status: | RESOLVED ANSWERED | ||
| Severity: | high | CC: | bagasdotme |
| Priority: | P3 | ||
| Hardware: | Intel | ||
| OS: | Linux | ||
| Kernel Version: | Subsystem: | ||
| Regression: | No | Bisected commit-id: | |
| Attachments: |
iommu-on-bad-dell.txt log
iommu-off-good-dell.txt log lspci-dell.txt output kernel-config-dell.txt output iommu-on-vga-chip-off-good-lenovo.txt log |
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Created attachment 305142 [details]
iommu-off-good-dell.txt log
Created attachment 305143 [details]
lspci-dell.txt output
Created attachment 305144 [details]
kernel-config-dell.txt output
Created attachment 305145 [details]
iommu-on-vga-chip-off-good-lenovo.txt log
(In reply to jb from comment #0) > Both laptops have Intel VT-x amd VT-d enabled in EFI (Dell) and BIOS > (Lenovo). > I also tested the Dell laptop with latest Manjaro live and Win 10, and there > is no problem (hardware, etc). What kernel version on that Manjaro ISO? (In reply to Bagas Sanjaya from comment #5) > (In reply to jb from comment #0) > > Both laptops have Intel VT-x amd VT-d enabled in EFI (Dell) and BIOS > > (Lenovo). > > I also tested the Dell laptop with latest Manjaro live and Win 10, and > there > > is no problem (hardware, etc). > > What kernel version on that Manjaro ISO? Manjaro 23.0.1 iso, default kernel 6.5.1-1, with IOMMU disabled as usual. Please post here as well: https://gitlab.freedesktop.org/drm/intel/-/issues No need to upload files twice, you can simply link to this issue. |
Created attachment 305141 [details] iommu-on-bad-dell.txt log I have a Dell Latitude 5500 laptop that has a flickering screen problem (with DRM error in logs) when I enable IOMMU (on kernel boot command line as most distros disable it per kernel config). I tested it with latest kernel 6.5.4 . Please find attachments with related entries: iommu-off-good-dell.txt iommu-on-bad-dell.txt kernel-config-dell.txt lspci-dell.txt In addition, for comparison (it may help in debugging), I also included an output from a Lenovo e550 laptop, which has the same OS (Arch Linux) and kernel and its config, with IOMMU enabled as above, but without the problem. Please find attachment swith related entries: ommu-on-vga-chip-off-good-lenovo.txt NOTE: the log shows an interesting line: pci 0000:00:02.0: DMAR: Disabling IOMMU for graphics on this chipset Both laptops have Intel VT-x amd VT-d enabled in EFI (Dell) and BIOS (Lenovo). I also tested the Dell laptop with latest Manjaro live and Win 10, and there is no problem (hardware, etc).