On Tue, 2009-06-30 at 10:25 +0200, "David Müller (ELSOFT AG)" wrote: > Hello > > While testing Linux kernel 2.6.30 on a Intel 855GME platform i noticed a > 3 minute delay during the Linux boot process in the case DDC support is > not available. > > I've tracked the problem down to the following lines in > driver/gpu/drm/i915/intel_crt.c: > > 289 /* > 290 * Wait for the border to be displayed > 291 */ > 292 while (I915_READ(pipe_dsl_reg) >= vactive) > 293 ; > 294 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample) > 295 ; > > The HW register pointed to by "pipe_dsl_reg" returns a constant value, > resulting in an endless loop at line 294. > > For me this looks like some parts of the graphic engine is not correctly > set up yet, especially as the corresponding code in the Xorg Intel > graphics driver mentions that the "current pipe's DPLL" has to be active > for this code to work. > > Or is this code designed to work in a graphic mode only, but not VGA > text mode?
My guess is that that pipe was currently off and so waiting for the scanline to move didn't work. There have been bugfixes in load detect since .30, could you try master and see if it's fixed? -- Eric Anholt e...@anholt.net eric.anh...@intel.com
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