OS/2, eCS & ArcaOS - Technical > Hardware

SNAP Driver Source

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Dan Eicher:
Thanks for the information Dariusz.
The press release seemed to hold a lot of promise.  You have cleared up for me, what happened.
Thank You.

Andi B.:

--- Quote from: Dariusz Piatkowski on August 13, 2025, 05:27:30 pm ---
--- Quote from: Dave Yeo on August 13, 2025, 02:29:52 am ---...Dariusz for example uses an X850 IIRC and has a dual monitor setup...
--- End quote ---

For what it's worth, I cannot even imagine a Desktop environment with a single display anymore. The fact that I can enjoy such a hardware setup on our OS/2 platform is THE reason why I will continue to use SNAP.

...
--- End quote ---
I used the X300 mit dual monitor setup (2x 1920x1200) many years. For the newer system I have to put in a ATI 550 which after some work from David A. (ticket) could drive my new 42,5" 3840x2160 monitor with nativ resolution using Panorama. Intel integrated couldn't be convinced to do it right.

Now again about 8-10 years later my current system could not drive this resolution with current Panorama using AMD internal GPU. Additional ATI550 can be convinced to setup the right resolution. But then I've to set Virtualaddresslimit<=1536 as otherwise the system crashes immediately. But that's no useful option for me.

So after about 15-17 years using OS/2 with 3840x >=1200 I now have to switch to another primary OS. Or live with crappy 2560x1440 displayed on a 3840x2160 screen. :-( Or hope David accidently can fixes this memory problem.

Eugene Gorbunoff:
To Andi B.
What is the current status of widescreen activation? => custom videomodes
* it's necessary use ati amd radeon ?
* nvidia allows use custom modes?
* Intel video cards - custom modes?

Dariusz Piatkowski:
Hey Andi!


--- Quote from: Andi B. on August 14, 2025, 08:40:48 am ---...Now again about 8-10 years later my current system could not drive this resolution with current Panorama using AMD internal GPU. Additional ATI550 can be convinced to setup the right resolution. But then I've to set Virtualaddresslimit<=1536 as otherwise the system crashes immediately. But that's no useful option for me...
--- End quote ---

Just on a hunch, have you played with the 'Video Memory Limit' setting of the gaoption.exe?


--- Code: ---Options for ATI Radeon X850 Series (device 0):

  Invert .................. Off
  Rotation ................ Off
  Flipped ................. Off
  Reduced DVI Timings...... Off
  Prefer 16 bit per pixel.. On
  Prefer 32 bit per pixel.. On
  Compressed Framebuffer... On
  Allow DDC BIOS........... On
  PCI bus mastering........ On
  Video memory packets..... On
  Hardware acceleration.... Full
  Multi Head Display....... Yes
     0: 1920 x 1200 (   0,   0,1920,1200)
     1: 1920 x 1200 (1920,   0,3840,1200)
  VESA DPVL Mode........... Off

Global options for all devices:

  Force VBE Fallback ...... Off
  Force VGA Fallback ...... Off
  Allow non-certified ..... On
  Disable write combining . Off
  Use BIOS for LCD panel... Auto
  Video Memory Limit....... 24 Mb
  Shared AGP memory size... 4096 Kb
  Use system memory driver. Off
  Disable DDC detection.... Off
  Enable AGP FastWrite..... Off
  Maximum AGP data rate.... 8X
  Virtual Display.......... Off

--- End code ---

Once you execute that gaoption command that setting is saved and upon next reboot you'll find something like this in your graphics.log file ('==>' is mine for emphasis):


--- Code: ---...
GA_enumerateDevices: Found 1 PCI/AGP display devices

Global options for all devices:
  Force VBE Fallback ...... Off
  Force VGA Fallback ...... Off
  Allow non-certified ..... On
  Disable write combining . Off
  Use BIOS for LCD panel... Auto
  Shared AGP memory size... 4096 KB
  Use system memory driver. Off
  Disable DDC detection.... Off
  Virtual Display.......... Off

Loading driver for device 0 (radeon.drv)
---------------------------------------------------------

==> Video memory limited to user supplied value of 24MB

Attempting to enable write combining, base = 0xD0000000, length = 0x01800000 ...
Failed: UNKNOWN ERROR!
Loading chipset filters...done.
Loading splash screen...done.

Graphics device configuration:
  Manufacturer......... ATI
  Chipset.............. Radeon X850 Series
  Bus Type............. PCI Express
==>  Memory............... 24576 KB
  DAC.................. ATI Internal 24 bit DAC
  Clock................ ATI Internal Clock
  Memory Clock......... 400 MHz
  Default Memory Clock. 400 MHz
  Maximum Memory Clock. 400 MHz
  Driver Revision...... 3.2, Build 29
  Driver Build......... May  2 2017
  Certified Version.... Not Certified

Graphics device options:
  Invert .................. Off
  Rotation ................ Off
  Flipped ................. Off
  Prefer 16 bit per pixel.. On
  Prefer 32 bit per pixel.. On
  PCI bus mastering........ On
  Hardware acceleration.... Full
...

--- End code ---

I run a huge JFS cache of 1G...and given that my ATI X850 card is a 256M card I was running into issues early on allocating enough RAM for the cache. It is not until I pared that back to just about 24M (to account for 24-bit and resulting resolution over the two displays) that I was able to free up the system RAM for cache use.

Sooo...seeing as you have to play with the Virtualaddresslimit setting I wonder if that is worth a try (if you haven't done so already of course)?

Roderick Klein:

--- Quote from: Andi B. on August 14, 2025, 08:40:48 am ---
--- Quote from: Dariusz Piatkowski on August 13, 2025, 05:27:30 pm ---
--- Quote from: Dave Yeo on August 13, 2025, 02:29:52 am ---...Dariusz for example uses an X850 IIRC and has a dual monitor setup...
--- End quote ---

For what it's worth, I cannot even imagine a Desktop environment with a single display anymore. The fact that I can enjoy such a hardware setup on our OS/2 platform is THE reason why I will continue to use SNAP.

...
--- End quote ---
I used the X300 mit dual monitor setup (2x 1920x1200) many years. For the newer system I have to put in a ATI 550 which after some work from David A. (ticket) could drive my new 42,5" 3840x2160 monitor with nativ resolution using Panorama. Intel integrated couldn't be convinced to do it right.

Now again about 8-10 years later my current system could not drive this resolution with current Panorama using AMD internal GPU. Additional ATI550 can be convinced to setup the right resolution. But then I've to set Virtualaddresslimit<=1536 as otherwise the system crashes immediately. But that's no useful option for me.

So after about 15-17 years using OS/2 with 3840x >=1200 I now have to switch to another primary OS. Or live with crappy 2560x1440 displayed on a 3840x2160 screen. :-( Or hope David accidently can fixes this memory problem.

--- End quote ---

I have seen your ticket. I will mention this to Steve Levine if he can find out what is going on!

Roderick

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