#12714: intel_extreme driver not recognizing gpu anymore
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Reporter: jua | Owner: kallisti5
Type: bug | Status: assigned
Priority: normal | Milestone: Unscheduled
Component: Drivers/Graphics/intel_extreme | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking: 12735
Has a Patch: 0 | Platform: All
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Comment (by kallisti5):
Definitely looks like the PLL's are getting calculated differently on SnB:
Before:
{{{
PLL limits, min: p 5 (p1 1, p2 10), n 1, m 79 (m1 12, m2 5)
PLL limits, max: p 80 (p1 8, p2 5), n 5, m 127 (m1 22, m2 9)
compute_pll_divisors: required MHz: 75.2
compute_pll_divisors: found: 75.2 MHz, p = 40 (p1 = 4, p2 = 10), n = 3, m
= 94 (m1 = 17, m2 = 9)
}}}
Now:
{{{
compute_dpll_g4x: required MHz: 75.2
PLL limits, min: p 28 (p1 2, p2 14), n 1, m 79 (m1 12, m2 5)
PLL limits, max: p 112 (p1 8, p2 14), n 3, m 118 (m1 22, m2 9)
compute_dpll_g4x: best MHz: 31.1429 (error: 44.0571)
compute_pll_divisors: found: p = 112 (p1 = 8, p2 = 14), n = 3, m = 109
(m1 = 18, m2 = 7)
}}}
The PLL error is too high there.
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Ticket URL: <https://dev.haiku-os.org/ticket/12714#comment:22>
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