| Summary: | [r300] dual head output is *very* slow on rotated display | ||
|---|---|---|---|
| Product: | xorg | Reporter: | Till Matthiesen <entropy> |
| Component: | Driver/Radeon | Assignee: | xf86-video-ati maintainers <xorg-driver-ati> |
| Status: | RESOLVED NOTOURBUG | QA Contact: | Xorg Project Team <xorg-team> |
| Severity: | normal | ||
| Priority: | medium | ||
| Version: | git | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
The problem is your total desktop (2880 pixels) is larger than that max texture size of the GPU (2048 pixels), so it has to fall back to software when doing the rotation. The only way to fix it is to teach X to treat each head as a separate buffer rather than using one big buffer for both heads. (In reply to comment #1) > The problem is your total desktop (2880 pixels) is larger than that max texture > size of the GPU (2048 pixels), so it has to fall back to software when doing > the rotation. The only way to fix it is to teach X to treat each head as a > separate buffer rather than using one big buffer for both heads. Thanks, Alex. I see, so my bad. Just as a suggestion, wouldn't it be useful to log this kind of fall back in Xorg.0.log? I don't know about the maximum texture size an asic has and I guess lots of others might not as well. This would at least give a clear hint on what is wrong. |
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Hi all, I'm using using libdrm, mesa [r300g] and xf86-video-ati from git. The setup I'm facing the issue with is a Thinkpad R50p with r300 class GPU [AGP]. When I use the internal display together with an external display [D-Sub] which is rotated the output on the external display is *extremely* sluggish. You can watch the screen being build up. Honestly, it takes the external screen 1-2 seconds to finish refresh. It's currently simply not possible to work in this configuration for me. xrandr: Screen 0: minimum 320 x 200, current 2880 x 1200, maximum 4096 x 4096 VGA-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm 1280x1024 60.0*+ 75.0 1280x960 75.0 60.0 1152x864 75.0 1024x768 75.1 70.1 60.0 832x624 74.6 800x600 72.2 75.0 60.3 56.2 640x480 72.8 75.0 66.7 60.0 720x400 70.1 DVI-0 disconnected (normal left inverted right x axis y axis) LVDS connected 1600x1200+1280+0 (normal left inverted right x axis y axis) 0mm x 0mm 1600x1200 60.0*+ 60.0 1400x1050 60.0 60.0 1280x1024 59.9 60.0 1440x900 59.9 1280x960 60.0 59.9 1280x854 59.9 1280x800 59.8 1280x720 59.9 1152x768 59.8 1024x768 60.0 59.9 800x600 60.3 59.9 848x480 59.7 720x480 59.7 640x480 59.9 59.4 S-video disconnected (normal left inverted right x axis y axis) lspci: 01:00.0 VGA compatible controller: ATI Technologies Inc M10 NT [FireGL Mobility T2] (rev 80) (prog-if 00 [VGA controller]) Subsystem: IBM Device 054f Flags: bus master, fast Back2Back, 66MHz, medium devsel, latency 66, IRQ 11 Memory at e0000000 (32-bit, prefetchable) [size=128M] I/O ports at 3000 [size=256] Memory at c0100000 (32-bit, non-prefetchable) [size=64K] [virtual] Expansion ROM at c0120000 [disabled] [size=128K] Capabilities: [58] AGP version 2.0 Capabilities: [50] Power Management version 2 Kernel driver in use: radeon Kernel modules: radeon Configuration of the displays: xrandr --output LVDS --mode 1600x1200 --right-of VGA-0 xrandr --output VGA-0 --mode 1280x1024 --rotate left Thanks in advance and keep up the excellent work!