Bug 206147
| Summary: | Xen paravirt framebuffer is mangled under firstboot | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Daniel Berrangé <berrange> |
| Component: | xen | Assignee: | Xen Maintainance List <xen-maint> |
| Status: | CLOSED RAWHIDE | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | rawhide | CC: | bstein, katzj |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2006-09-12 15:22:46 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Attachments: | |||
Created attachment 136072 [details]
Log file from Xorg when running under firstboot
Created attachment 136073 [details]
Logfile from Xorg when running (normally) under GDM
Created attachment 136074 [details]
Display info when running firstboot
Created attachment 136076 [details]
Display info when running (normally) under GDM
Created attachment 136077 [details]
Screenshot of mangled firstboot display
Okay, firstboot fixed to use the same logic as everything else which will make this a non-issue. |
Description of problem: When the firstboot program starts up in a Xen paravirt guest, the framebuffer is completely mangled. The screen is half-width & duplicated side-by-side, and has a serious colour shift across it. Version-Release number of selected component (if applicable): 2.6.17-1.2630.fc6xen #1 SMP Wed Sep 6 16:40:06 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux How reproducible: Always Steps to Reproduce: 1. Provision a new rawhide guest 2. Attach VNC viewer to guest display at first boot after installation 3. Wait for firstboot to launch Actual results: Screen is half-size & colour shifted Expected results: Screen displays "normally" Additional info: Hacking the rhpxl sources to save Xorg logs to a file rather than /dev/null, I managed to compare the Xorg logs to normal X startup under the Xen paravirt framebuffer. The critical difference is: < (**) FBDEV(0): Depth 24, (--) framebuffer bpp 32 < (==) FBDEV(0): RGB weight 888 --- > (**) FBDEV(0): Depth 16, (--) framebuffer bpp 16 > (==) FBDEV(0): RGB weight 565 So, firstboot is starting an X server in 16 bpp mode, which explains the half-width display & the 565 rgb weight explains the colour shift. The question is how is this even possible ? The kernel paravirt framebuffer driver is hardcoded to 32bpp, 800x600 so there should be no way for the firstboot Xorg server to even try a 16bpp display - it simply isn't supported by the virtual display driver.