I'm using kernel 2.6.33-rc2 on a 5200 with two scenns attached. This gets detected very well: [ 0.901764] [drm] nouveau 0000:01:00.0: failed to evaluate _DSM: 5 [ 0.902107] [drm] nouveau 0000:01:00.0: Detected an NV30 generation card (0x034200a2) [ 0.902191] [drm] nouveau 0000:01:00.0: Attempting to load BIOS image from PROM [ 1.026027] [drm] nouveau 0000:01:00.0: ... appears to be valid [ 1.026294] [drm] nouveau 0000:01:00.0: BMP BIOS found [ 1.026297] [drm] nouveau 0000:01:00.0: BMP version 5.38 [ 1.026301] [drm] nouveau 0000:01:00.0: Bios version 04.34.20.18 and [ 1.352207] [drm] nouveau 0000:01:00.0: allocated 1280x1024 fb: 0x9000, bo f6f50e00 [ 1.355869] [drm] DAC-7: set mode 1280x1024 3f [ 1.366246] [drm] nouveau 0000:01:00.0: Setting dpms mode 0 on vga encoder (output 0) [ 1.366251] [drm] nouveau 0000:01:00.0: Output VGA-1 is running on CRTC 0 using output A [ 1.366269] [drm] DAC-8: set mode 1024x768 40 [ 1.376641] [drm] nouveau 0000:01:00.0: Setting dpms mode 0 on vga encoder (output 1) [ 1.376646] [drm] nouveau 0000:01:00.0: Output DVI-I-1 is running on CRTC 1 using output B Now I get [ 1.379072] Console: switching to colour frame buffer device 128x48 which fits exacly on the smaller screen. But on the bigger screen this uses only a part of the console and looks quite strange. The last line is somewhere below the middle of the screen and as well the last character on the right is not a the right side. So I assume it uses only the resolution 1024x768 on a 1280x1024 screen.
This is the expected behaviour. fbcon was never designed for multiple displays, so this is the best that can be done at this time.
I know handling of this situation is not very easy. But the current situation is Would it be possible to use in both screens the lower resolution, so in my case in both 1024x768? (In general the highest res all active screens support) At least this would avoid some trouble. Switching to X would than cause a mode change on the bigger screen, but I think that is less problematic compared to the usage of a small part of a bigger screen.
Achim, this is more of a user preference to choose one over the other: 1. use the best mode on each output 2. use the largest common mode on all outputs Case 1 is what X does, and one goal of KMS is flickerless boot, so it fits and is the default policy in general. Case 2 you should be able to achieve with the "video" kernel command line parameter, forcing the small mode on the big monitor. I hope it is documented in the kernel Documentation, since I do not recall the correct syntax.
(In reply to comment #3) > Case 2 you should be able to achieve with the "video" kernel command line > parameter, forcing the small mode on the big monitor. I hope it is documented > in the kernel Documentation, since I do not recall the correct syntax. That depends if nouveau driver uses modedb or not. from Documentation/fb/modedb.txt Drivers that support modedb boot options 123 Boot Name Cards Supported 124 125 amifb - Amiga chipset frame buffer 126 aty128fb - ATI Rage128 / Pro frame buffer 127 atyfb - ATI Mach64 frame buffer 128 pm2fb - Permedia 2/2V frame buffer 129 pm3fb - Permedia 3 frame buffer 130 sstfb - Voodoo 1/2 (SST1) chipset frame buffer 131 tdfxfb - 3D Fx frame buffer 132 tridentfb - Trident (Cyber)blade chipset frame buffer 133 vt8623fb - VIA 8623 frame buffer But here you can not find nouveau. So either a new doc gets created with the options to handle this, or this doc gets updated including nouveau. I hope with staging drivers you are allowed to change the existing docs-) => I assume I'll close this bug, and open a documentation bug?
(In reply to comment #4) > (In reply to comment #3) > > Case 2 you should be able to achieve with the "video" kernel command line > > parameter, forcing the small mode on the big monitor. I hope it is documented > > in the kernel Documentation, since I do not recall the correct syntax. > That depends if nouveau driver uses modedb or not. > > from Documentation/fb/modedb.txt That is the legacy fb option "video". I was talking about the drmfb "video" variant, but I cannot find the documentation. The only doc I know of is: http://cgit.freedesktop.org/nouveau/linux-2.6/tree/drivers/gpu/drm/drm_fb_helper.c#n68 The syntax is something like: video=<output>:<mode> Where output is as reported by the kernel DRM/KMS. A made-up example: video=DVI-I-1:1024x768 This option is for all DRM/KMS fb drivers AFAIK: intel, radeon and nouveau. It's a bit odd that it isn't properly documented yet.
the specified parameters work as expected. Thanks
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