| Summary: | [PATCH] Add "ForceLegacyCRT" option to Radeon driver for older VGA monitors | ||||||
|---|---|---|---|---|---|---|---|
| Product: | xorg | Reporter: | Mike A. Harris <mharris> | ||||
| Component: | Driver/Radeon | Assignee: | Xorg Project Team <xorg-team> | ||||
| Status: | RESOLVED FIXED | QA Contact: | |||||
| Severity: | normal | ||||||
| Priority: | high | ||||||
| Version: | git | ||||||
| Hardware: | x86 (IA32) | ||||||
| OS: | Linux (All) | ||||||
| Whiteboard: | |||||||
| i915 platform: | i915 features: | ||||||
| Bug Depends on: | |||||||
| Bug Blocks: | 351 | ||||||
| Attachments: |
|
||||||
Created attachment 482 [details] [review] xorg-x11-CVS-ati-radeon-forcelegacycrt.patch This patch applied clean to CVS when it was submitted. The Radeon driver has subsequently been modified and the patch no longer applies. If someone looks at this patch please, and tells me if they think it is clean enough to go in or not, I'd appreciate it. If it is acceptable, I will port it forward so it can be committed to CVS. If it is not, please let me know why, so I can either clean it up to be acceptable, or drop it on the floor. Thanks in advance. Couldn't you force it to CRT using: option "monitorlayout" "crt" rather than adding a new option. you should also work on dualhead cards if you hard code the monitor type for both crtc1 and crtc2. This patch is no longer needed as explained in comment #3. Closing. |
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.
The Radeon driver does not work with older VGA paperwhite displays and certain other older fixed frequency displays. The driver simply can't detect the monitor and so it bails. Here is the original Red Hat bug report for this issue: http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=69978 I've implemented a patch to add a new config file option named "ForceLegacyCRT" which overrides the autodetection logic and allows the user to use an older CRT that can't be autodetected. This should be safe for single-head setups, or multihead setups where only one monitor is connected to the Radeon hardware, and the other head(s) are on other video cards. In a dualhead setup using both heads on one Radeon card however, if this option is enabled and a legacy CRT is plugged in, it is possible that one of the monitors might be damaged due to receiving out of range signals. That isn't a bug however, it's a limitation in the old legacy monitor. Please apply to CVS for next release