From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Deucher Subject: Re: [Linux-fbdev-devel] drm_fb_helper: Impossible to change video mode Date: Thu, 11 Mar 2010 10:12:52 -0500 Message-ID: References: <21d7e9970911202027l1d4deec6p5750b8425cd6bb3f@mail.gmail.com> <21d7e9971003022102v232c099r441b0bd843b30313@mail.gmail.com> <1268302426.7444.117.camel@thor.local> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <1268302426.7444.117.camel@thor.local> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.sourceforge.net To: =?ISO-8859-1?Q?Michel_D=E4nzer?= Cc: linux-fbdev-devel@lists.sourceforge.net, dri-devel@lists.sourceforge.net, Paulius Zaleckas , Michal Suchanek 2010/3/11 Michel D=E4nzer : > On Wed, 2010-03-10 at 13:10 -0500, Alex Deucher wrote: >> On Wed, Mar 10, 2010 at 1:05 PM, Alex Deucher wr= ote: >> > On Wed, Mar 10, 2010 at 12:42 PM, James Simmons wrote: >> >> >> >> See my other post about what fbdev really means in its historical >> >> context. The struct fb_info really maps better to drm_crtc than to >> >> drm_framebuffer. In fact take the case of the matrox fbdev driver. It >> >> creates two framebuffer devices even tho it used one static framebuff= er. >> >> What the driver does is splits the framebuffer in two and assigned ea= ch >> >> part to a CRTC. >> > >> > The only problem with that is that it eats a lot of memory for the >> > console which limits X when it starts. On cards with limited vram , >> > you might not have enough memory left for any meaningful acceleration >> > when X starts. >> >> It would be nice to find a way to reclaim the console memory for X, >> but I'm not sure that can be done and still provide a good way to >> provide oops support. > > What do you think the average user will care about more? > > =A0 =A0 =A0* Seeing kernel oops/panic output about once in a lifetime. > =A0 =A0 =A0* Being able to start/use X in the first place and enabling it= to > =A0 =A0 =A0 =A0use all of VRAM. > > Personally, I've never even seen any kernel oops/panic output despite > numerous opportunities for that in the couple of months I've been using > KMS. But I have spent considerable time and effort trying to get rid of > the pinned fbcon BO. If the oops/panic output is the only thing > preventing that, maybe that should only be enabled via some module > option for developers. I'm all for it! Alex ---------------------------------------------------------------------------= --- Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev --