Force specific Resolution in VESA Driver

Forum thread started by ToraBora on Mon, 2014-06-23 05:43

Hi,

is there a way to force the VESA driver to use a specific resolution? I use a KVM Switch (DVI) and it seems that this one does not pass DDC information in a correct way, so i'm stuck with 1280x1024 as the maximum resolution even if my display is capable of 1920x1080. When using a direct connection, i can use the native resolution.

Additionally, is there a reason my system does not use the nvidia accelerant - i'm using a GeForce 8600 GT graphics card:

device Display controller (VGA compatible controller, VGA controller) [3|0|0]
  vendor 10de: NVIDIA Corporation
  device 0402: G84 [GeForce 8600 GT]

/boot/system/add-ons/accelerants> listimage | grep -i accel | grep -v grep
 1294                 /boot/system/add-ons/accelerants/vesa.accelerant 0xeac000 0xeb0000    0          0

The complete system log can be found here:
http://pastebin.com/4QtPepQC

Thanks,
ToraBora

Comments

Re: Force specific Resolution in VESA Driver

by humdinger - 2014-06-23 15:55

Hi ToraBora!

Your nvidia chipset doesn't seem to be supported, the device id isn't listed.

You should be able to enforce a VESA resolution by creating a file ~/config/settings/kernel/drivers/vesa and put in something like
mode 1920 1080 32
The last number is the bitmap depth.

Hope that helps also in case of your KVM.

Regards,
Humdinger

Re: Force specific Resolution in VESA Driver

by ToraBora - 2014-06-24 04:19

Hi,
i just tested this and unfortunately it did not work - the resolution stays at a maximum of 1280x1024 even if there's another resolution in the config file.

Also did some other testing:
- Other KVM Switch (Level One DVI; http://www.conrad.de/ce/de/product/995896/LevelOne-2-Port-USB-DVI-KVM-Sw...)
----- With GeForce 8600 GT: Same problem
----- With Radeon HD 2600: 1920x1080 available, distorted picture when using this resolution
- KVM Switch ATEN CS1762:
----- With GeForce 8600 GT: Same problem
----- With Radeon 2600: Same problem other Resolutions available

The KVMs and Graphics card work smooth in other OSes (tested Live Linux). Could this be a bug worth reporting and are there any tools to read the EDID information passed from the monitor back to the driver?

ToraBora

Re: Force specific Resolution in VESA Driver

by Earl Colby Pottinger - 2014-06-24 17:02

Question, how do these video cards work out if there is no KVM used?

PS. Just holding down the shift-key just before Haiku starts to boot will put you in safe mode.

Re: Force specific Resolution in VESA Driver

by ToraBora - 2014-06-25 11:56

Hi,
the cards work as intended when not using a KVM switch. In the meantime i also tested a GeForce 7600 (which uses the nvidia accelerator) and this one also works as intended with the KVM attached.

To me it seems like some kind of bug. I will post a Bug report with the system.log of all different configurations attached.
ToraBora