On 10 August 2011 18:41, Jim Price <d1vers...@hotmail.com> wrote: > I think something is up with the attributions here - thunderbird and gmane > are telling me this post is from Liam, but I think it may have been said by > some combination of Liam and James, or just James:
Odd. You replied a bit to both of us. :¬) > The next bit sounds like it might be attributable to Liam? Or not? > >> Aha! That is interesting. >> >> I will say that on my old Thinkpad, to use multiple monitors at all, I >> have to drop all the screens down to 16-bit colour. >> >> (Either 65,535 or 32,768 colours, it makes no real difference. Most >> "16-bit colour" modes are actually 15-bit colour: 5 bits for R, G& >> B.) >> >> On Windows I have to do this manually, by setting both screens, >> individually, to 32K colours - *then* changing resolutions. The >> Thinkpad only has 16MB of video RAM, which limits it to 2 screens at >> 1024*768 in 24-bit colour. In 16-bit colour, I can run 1024*768 + >> 1280*1024. On Ubuntu, there is no UI for changing colour depth, so I >> use the xorg.conf file I documented in my blog. >> >> You might want to try this if your machine is of a similar age. Yes, that was me. > I'm thinking checking the amount of memory allocated to the graphics in the > BIOS might be worth doing. For X to have enough memory for both displays at > 32bit colour, you would need ~75MB, although the settings are likely to be > in power-of-two increments, so you might need to set it to 128MB shared > memory as the next highest setting. FWIW, on my Thinkpad, you can't - it has 16MB of physical VRAM and that's it. The symptom of VRAM starvation, just for the record, is that the dialogs /show/ higher resolutions (e.g. 1024*768 + 1280*1024) but if you try to select the higher ones, you actually get a lower one, such as 2 x 1024*768. >> There are no proprietary ATI drivers for my "Mobility Radeon" chipset >> - it's too old. > > That's what I suspected. > > Can you tell us what model of laptop you have there, so I can google for the > graphics configuration it supports? That was me, but FWIW, it's an IBM Thinkpad X31. http://www.thinkwiki.org/wiki/Category:X31 http://www.thinkwiki.org/wiki/ATI_Mobility_Radeon_7000 -- Liam Proven • Info & profile: http://www.google.com/profiles/lproven Email: lpro...@cix.co.uk • GMail/GoogleTalk/Orkut: lpro...@gmail.com Tel: +44 20-8685-0498 • Cell: +44 7939-087884 • Fax: + 44 870-9151419 AIM/Yahoo/Skype: liamproven • MSN: lpro...@hotmail.com • ICQ: 73187508 -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/
